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(No Model.) A 2 Sheets-Sheet 1. W. R. KINSMA N. ELEGTRIG DESK LIGHT.

Patented Oct. 22, 1895.

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Patented Oct. 22, 1895.

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UNTTEE STATES PATENT @FFliCiEe WALTER R. KINSMAN, OF ARLINGTON, NEW JERSEY, ASSIGNOR TO THOMAS l. MC-LEOD, OF NEW YORK, N. Y.

ELECTRIC DESK-LIGHT.

SPECIFICATION forming part of Letters Patent No. 548,339, dated October 22, 1895.

Application filed October 4. 1393- To aZZ whom it may concern..-

Be it known that I, WALTER R. KINSMAN, of Arlington, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Electric Desk-Lights; and I do hereby declare that the following is a full and exact description thereof, reference being bad to the accompanying drawings, and to the letters of reference to marked thereon, making a part of this specification.

Various means have been devised hitherto for supporting electric lights so that they may be used to advantage by persons working at desks or tables; but so far as I know such means have involved the placing of the lamp itself in such a positionwith respect to the refiector that the socket of the lamp is interposed between the same and the reflector, with the result that the greatest possible amount of illumination is not secured. Furthermore, where any attempt has been made to enable the person using the light to shade or modify it according to his requirements the means employed have been complicated, cumbrous, and generally ineificient.

The object of my invention is to produce a lamp for desk use which shall be easily ad- 3' ustable in position,shall furnish the greatest amount of illumination from a given lamp, shall be so constructed as to enable the person using it to modify orshade the light as he may desire, and shall be compact, neat, and attractive in appearance and not liable to be broken in use.

in accordance with my invention the lamp is supported within a casing, which is preferably cylindrical, and is partly cut away on one side to allow the rays of light to escape, while the inner surface of the opposite side of the casing acts as a reflector. The lamp is surrounded by a cylindrical glass shade, which has one portion clear and other portions ground or tinted, as desired, and is adapted to be rotated to bring one portion or another in front of the light. The construction will be explained in detail hereinafter and other features of novelty will be pointed out.

In the accompanying drawings, Figure 1 is a top view of a lamp constructed in accord ance with my invention and supported from Serial No. 488,139. (No model.)

the top of a roll-top desk, a portion of which is shown. Fig. 2 is an end elevation of the same, the portion of the desk-top being shown in section. Fig. 3 is a view similar to Fig. 2, but showing the lamp supported upon a standard,which may be set upon a table or else Where. Fig. 4 is a bottom View of the lamp on a larger scale than that of the preceding figures. Fig. 5 is a longitudinal central section on the plane of the line mo: of Fig. 1, looking in the direction of the arrow'o thereon, the scale being the same as that of Fig. 4. Fig. 6 is a cross-section on line y g of Fig. 1, looking inthe direction of the arrow 6 thereon; and Fig. 7 is a cross-section on the same line 'y y of Fig. 1, looking in the direction of the arrow 7 thereon, the scale of Figs. 6 and 7 being the same as that of Figs. 4 and 5.

The lamp proper A,which may be of any of the usual varieties, is partly inclosed within a metal casing B, which is preferably cylindrical in cross-section and is preferably supported with its axis horizontal. As represented in Figs. 1 and 2, the casing B is supported by a telescoping arm, one member 0 of which is fixed to the casing, while the other member D is flattened on its under side, as shown, to rest upon the desk-top and hold the lamp steady, and is provided with a hook at, which is adapted to engage the overhanging edge of the top of a roll-top or other similar desk. The arm may be fixed in any desired positionby a set-screw 61.

While Iprefer the means just described for supporting the lam p for use with desks of the class referred to, the principal feature of my invention is not dependent upon the exact nature of the support, and in Fig. 3 I have represented the casing as fixed to and supgo ported by a standard D, which may be set upon a table-top or elsewhere.

The casing B is cut away for about a third of its circumference, as from h to b, and its inner surface is preferably polished, so that 5 it may reflect through the opening Z) Z) the rays of light which may fall upon it. One end of the casing B is closed by a plate E, to which the lamp-socket A is adapted to be fixed, so that the lamp may be supported with its axis coincident or parallel with the axis of the easing B. As represented in the drawings, the

plate has a central aperture, which is of a sufficient diameter to receive the socket A of the largest lamp that may be used, and in order that the socket may be held firmly in place, whether it fits snugly within the aperture or not, I prefer to apply to the socket two stout rubber rings e e, one on each side of the plate E. These rings will hold the socket in position and yet will permit it to be removed without injury whenever it may be desired. The plate E may be held to the casing B by any suitable means, but preferably is provided with a flange e, which fits snugly upon the end of the casing, so that the plate or cap may be removed readily. The opposite end of the casing 13 is closed by a similar plate F, having a flangef, which fits snugly upon the casing. The plate F furnishes a bearing for a stud G, which has fixed to its inner end a holder H, adapted to receive one end of a cylindrical glass shade K, which surrounds the lamp A and preferably extends nearly to the other end of the casing B. The stud G is provided with a knob g, by means of which the shade K may be rotated about the lamp. One portion of the shade, corresponding in width to the width of the opening in the casing B, as from h to h, may be left clear, a second portion, as from h to 79, may be ground, and the remaining portion, as from 7L2 to h, may be tinted with any desired color or may be rendered opaque, so that by rotating the shade about the lamp the light may be varied as desired.

An adjustable shade or screen L may beprovided for the outside of the casing 13 to protect the eyes of the person using the lamp from the direct rays, and is preferably pivoted or adapted to swing with respect to the casing, so that more or less of the direct rays may be intercepted while other rays are re fiect ed from its undersurface and aredirected down upon the work. I have represented the shade L as a rigid plate having an ear Z, with a slot Z to. receive a binding-screw Z which may be threaded into the plate F, and serves to hold the shade in any desired position.

I claim as my invention- 1. The combination, in a desklight, of a cylindrical casing having a removable cap on one end and having a portion of its side cutaway, said cap fitting over the end of the casing and having an aperture, an electric lamp horizontally arranged Within said cylindrical casing and having its socket inserted through the aperture, so that the key is Without the casing, means for securing said lamp in position comprising two spring collars arranged around the socket upon opposite sides of the cap and bearing against the same, a shade concentric with the cylinder and located within the same, and means for rotatingit, substantially as described.

2. The combination of a cylindrical casing having open ends and having a portion of its side cut away, a cap having a flange whereby it is removably supported upon one end of said casing and having a central aperture, an electric lamp having its socket inserted through said aperture whereby it can be-readily extinguished or lighted, a cap covering the other end of said casing, a rotatable shadeholder supported by the last named cap, and a telescopic arm having one member provided with a hook and adapted to rest upon a desktop and having the other member attached to the side of said casing to hold the same in a horizontal position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALTER R. KINSMAN. \Vitnesses:

A. N. JESBERA, A. WIDDER. 

